Dtc B124B Automatic High Beam System

Vehicle Exterior. Land Cruiser. Urj200, 202 Grj200 Vdj200
Lighting (Ext). Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FOR DTC

CHECK PRE-CRASH SAFETY SYSTEM

DTC B124B Automatic High Beam System


DESCRIPTION

The main body ECU (multiplex network body ECU) determines the status of the automatic high beam system based on the automatic high beam system signal from the forward recognition camera*1 or inner rear view mirror assembly*2.
  1. *1: w/ Pre-crash Safety System
  2. *2: w/o Pre-crash Safety System

DTC Code
DTC Detection Condition
Trouble Area
B124B
Malfunction in automatic high beam system
  1. CAN communication system
  2. Main body ECU (multiplex network body ECU)
  3. Inner rear view mirror assembly (w/o Pre-crash safety system)
  4. Forward recognition camera (w/ Pre-crash safety system)
  5. Pre-crash afety system
  6. Lane departure alert system
  7. SFI system (for 1UR-FE, 3UR-FE)
  8. ECD system (for 1VD-FTV)
  9. Vehicle stability control system

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Lighting (Ext).Lighting System. Dtc B124B Automatic High Beam System


Land Cruiser. Urj200, 202 Grj200 Vdj200.Lighting (Ext).Lighting System. Dtc B124B Automatic High Beam System


INSPECTION PROCEDURE

NOTICE:
  1. for LHD with Central Gateway ECU
    First perform the communication function inspections in How to Proceed with Troubleshooting to confirm that there are no CAN communication malfunctions before troubleshooting this symptom (Click here).
  2. for LHD without Central Gateway ECU
    First perform the communication function inspections in How to Proceed with Troubleshooting to confirm that there are no CAN communication malfunctions before troubleshooting this symptom (Click here).
  3. for RHD with Central Gateway ECU
    First perform the communication function inspections in How to Proceed with Troubleshooting to confirm that there are no CAN communication malfunctions before troubleshooting this symptom (Click here).
  4. for RHD without Central Gateway ECU
    First perform the communication function inspections in How to Proceed with Troubleshooting to confirm that there are no CAN communication malfunctions before troubleshooting this symptom (Click here).
  5. w/ Pre-crash System
    1. When replacing the forward recognition camera, replace it with a new one and be sure to initialize the settings. If an ECU which was installed to another vehicle is used, the information stored in the forward recognition camera will not match the information from the vehicle and, as a result, a DTC may be output.
    2. When the forward recognition camera is replaced with a new one or it is removed, camera beam axis learning must be performed.
HINT:
  1. w/ Pre-crash Safety System
    This DTC is output simultaneously from the forward recognition camera when DTCs related to the items below are output.
    1. Wheel speed sensor malfunction
    2. Yaw rate sensor malfunction
    3. Steering angle sensor system malfunction
    4. CAN communication lost
1.CHECK FOR DTC

  1. Check for DTCs (Click here).

    Result
    Result
    		Proceed to
    Only DTC B124B is output (w/ Pre-crash Safety System)
    		A
    Only DTC B124B is output (w/o Pre-crash Safety System)
    		B
    DTC B124B is output at the same time
    		C


B
REPLACE INNER REAR VIEW MIRROR ASSEMBLY (Click here)

C
GO TO DIAGNOSTIC TROUBLE CODE CHART (Click here)
A


2.CHECK PRE-CRASH SAFETY SYSTEM

  1. Check that a pre-crash safety system (Click here).

    Result
    Result
    		Proceed to
    OK (for LHD)
    		A
    OK (for RHD)
    		B
    NG
    		C


B
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (Click here)

C
GO TO PRE-CRASH SAFETY SYSTEM (Click here)
A

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (Click here)